An electron of mass m travelling with speed u collides with an atom and its speed is
reduced t...
An electron of mass m travelling with speed u collides with an atom and its speed is
reduced to v. the speed of the atom is unaltered, but one of its electrons is excited
to a higher energy level and then returns to its original state, emitting a photon of
light. show that the frequency of this photon is given by --
m(u² -2²)/2h
Answers: 3
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